So after some period of inactivity, my FC servers with infiniband cards in them seem to go to sleep or something. If I login to the machine and try to ping other machines with IB interfaces, the first request takes much longer than the others. This is not so over Ethernet.
compute-4-12 ~]# ping ib-s0-1 (this is a solaris machine)
PING ib-s0-1.local (192.168.1.19) 56(84) bytes of data.
64 bytes from ib-s0-1.168.192.in-addr.arpa (192.168.1.19): icmp_req=1 ttl=255 time=3.64 ms
64 bytes from ib-s0-1.168.192.in-addr.arpa (192.168.1.19): icmp_req=2 ttl=255 time=0.131 ms
64 bytes from ib-s0-1.168.192.in-addr.arpa (192.168.1.19): icmp_req=3 ttl=255 time=0.222 ms
compute-4-08 ~]# ping c4-7 (identical neighboring FC machine)
PING compute-4-07.local.local (10.255.255.187) 56(84) bytes of data.
64 bytes from compute-4-07.local.255.10.in-addr.arpa (10.255.255.187): icmp_req=1 ttl=64 time=1.28 ms
64 bytes from compute-4-07.local.255.10.in-addr.arpa (10.255.255.187): icmp_req=2 ttl=64 time=0.108 ms
64 bytes from compute-4-07.local.255.10.in-addr.arpa (10.255.255.187): icmp_req=3 ttl=64 time=0.115 ms
64 bytes from compute-4-07.local.255.10.in-addr.arpa (10.255.255.187): icmp_req=4 ttl=64 time=0.119 ms
64 bytes from compute-4-07.local.255.10.in-addr.arpa (10.255.255.187): icmp_req=5 ttl=64 time=0.180 ms
This issue does not only affect ping. I created a user that mounts his home directory over nfs over infiniband. ssh'ing in takes longer the first time as well. If I ssh with verbosity turned up all the way, I get a brief hang at "we sent a hostbased packet, wait for reply" (this is the primary symptom I'm trying to get rid of since we want home directories over nfs over IB (without the initial delay)).
I just installed my first EVER bind DNS server. I am running bind9 on Ubuntu 10.04. Everything seems to be working great except one thing: If I ping a host that I have set up in bind by its HOSTNAME the pings take 5-6 seconds to reply/print to the screen between each echo response. If I ping by the host's IP address, they echo back very quickly.
I have read that IPv6 can cause this, but I have disabled it in /etc/sysctl.conf and the problem still exists.
I know everyone says this can't be a DNS issue, but this never was an issue with dnsmasq (which i was using prior), and it doesn't make sense that the ping are ONLY slow when pinging by hostname and not IP.
Configs below:
Ping by hostname - there is a 5-6 second delay between each one of the responses:
Code:
Ping by IP - the responses come VERY quickly one after the other:
My internet connection is pretty fast, but the initial connection to websites take about 4-10 seconds. Sometimes I even get a "connection timed out" error. Once and if the connection is made, the website loads up pretty quickly. I have no problems with internet speed otherwise as I get pretty good speeds for downloads and torrents.
Chrome shows "sending request" and Firefox shows "looking up" during this period of apparent inactivity.
It is not a DNS problem as I have switched DNS from my default to the OpenDNS servers. Besides, everything works fine on Windows with either DNS setup.
I have also tried switching off ipv6 by adding "alias net-pf-10 off" in modprobe.conf. I even switched off ipv6 in Firefox in about:config to no avail.
Oddly, wget seems to work fast and normally. And nslookup returns results almost instantly.
I'm running Lucid Alpha 1. Installed it about two weeks ago. Until a few days ago, the wireless networking was the best I've witnessed on any o.s. However, after last Wednesday's updates, connectivity now lags about 10-30 seconds whenever I open any web-page or access the repositories via aptitude. Granted after it gets going, it's fine. I noticed this same behavior in 9.10. I tested my XP connection and found no problems. .
I want to identify why my ISP is sometimes slow, and wonder how and what tools to use. The problem is as follows: While the lines are very fast, I experience that at times of day where there are presumably high traffic, a new initial connection is very slow and unstable. For example getting response from DNS is slow. And after getting the answer, getting response from a web server is also slow. Or sometimes there is no response at all, and I have to retry. Running a speed test will show high data rates. So it is only initial connection that is slow/unstable.
What is the explanation for these symptoms? Are there some tools and tests I can use to pinpoint the problem from home, without/before contacting the ISP?
Can someone explain the concepts of IPoIB and TCP over infiniband? I understand the overall concept and data rates provided by native infiniband, but dont quite understand how TCP and IPoIB fit in. Why do u need them and what do they do? What is the difference when someone says their network uses native IB, IPoIB or TCP with infiniband? Which one is better? I am not from a strong networking background, so it would be nice if you could elaborate.
I am using an virtual machine. where I need to ping from one machine to another. earlier I was able to ping. But after going to google.com once, I cannot ping back to this machine.
But if I gave ping -I eth1 <IP> then I can ping.
I cannot install any package, so tell me solution which includes not installing any package.
I work at an IT firm and was tasked with setting up an Infiniband network. As of now this consists of 2 Servers, each with a Mellanox Technologies MT25204 card, connected by a cableI installed the userspace drivers and the ofed drivers, added the following to my /etc/modules:
I have a connection an its slow in both ff and chrome...however i can ping sites and get the same response time as my xp machine which runs fast. usually around the 40ms mark with no lost packets.
Also when i do installs eg. of chrome etc, i was getting up to 500kB/s download. I just cant seem to replicate this browsing, its loading up at a dial up pace. The last time I had an issue like this was setting up my mums work laptop on our home network where the work had specific proxy settings, so we turn the off and it works fine.
I do not know how to tinker this
INFO:::: broadcom 4306 chip have tried ndiswrapper and bcmxx fwcutter
I have connected xp and fedora through crossover cable . xp has ip address 192.168.0.1/24 (manually assigned) fedora has 192.168.0.2/24 with default route equal to 192.168.0.1
I can ping fedora from xp computer but i can't able to ping xp from fedora computer.
I have manully edit the /etc/sysconfig/network-scripts/ifcfg-eth0 file with correct subnet mask and ip address because when i tried to give ip address manully in network manager the subnetmask is replaced with gateway address don't know why.
Now i want to share internet through crossover cable . xp is connected to internet through wireless usb adapeter.
I have two machines on this network, one running Ubuntu and the other running Fedora.
When I'm using the Wireless network on the Ubuntu machine, I cannot ping the Fedora machine. Everything else works. I can browse the net fine.
If I switch over to the Wired Network then I can ping the other machine.
I don't understand why ping doesn't work only over the Wireless. I can ping the router so I'm guessing it's getting blocked by the router but I didn't block ICMP traffic.
I tried asking on IRC and they ran out of ideas too to find out where the problem is.
I have a NAS which I've re-installed with DEBAIN. Mostly its all working great but when I tell it to ping a NetBIOS name it takes 10 seconds per attempt rather than 1. Despite this it actually resolves the NetBIOS names very quickly (the first line from the ping including the IP address appears almost instantly) it just sits there for 10 secs every ping.
# ping -c3 qnap PING qnap (192.168.1.100) 56(84) bytes of data. 64 bytes from 192.168.1.100: icmp_seq=1 ttl=64 time=0.175 ms 64 bytes from 192.168.1.100: icmp_seq=2 ttl=64 time=0.167 ms 64 bytes from 192.168.1.100: icmp_seq=3 ttl=64 time=0.158 ms
--- qnap ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 20036ms rtt min/avg/max/mdev = 0.158/0.166/0.175/0.016 ms # # ping -c 3 [URL] PING www.l.google.com (173.194.36.104) 56(84) bytes of data. 64 bytes from lhr14s01-in-f104.1e100.net (173.194.36.104): icmp_seq=1 ttl=49 time=40.3 ms 64 bytes from lhr14s01-in-f104.1e100.net (173.194.36.104): icmp_seq=2 ttl=49 time=25.4 ms 64 bytes from lhr14s01-in-f104.1e100.net (173.194.36.104): icmp_seq=3 ttl=49 time=25.7 ms --- www.l.google.com ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2022ms rtt min/avg/max/mdev = 25.491/30.518/40.313/6.926 ms
I'm really struggling to track down what may be causing this as it is strictly when resolving NetBIOS names yet it finds the IP immediately.
So, I have an Virtual Machine running CentOS 5.4. It sits behind a hardware firewall which also does NAT'ing. I've set up plenty of these, so I know for sure the firewall and NAT rules are set up correctly. From the host, I can ping anything in my subnet and the gateway. But I can't ping anything else beyond the gateway. I can perform DNS queries and when I try to ping, it finds the appropriate IP address.But from the outside, I can ping the PUBLIC address (It's a 1 public to 1 private address NAT, not 1 public to multiple private). I've tried it with IPTABLES on and off, with no change.
I have Mandriva One 2009.0 (192.168.1.100) on one box and Mandriva Free 2010.0 (192.168.1.118) on the other. I can ping router (192.168.1.1) from both of these boxes but I can't ping one box to the other and the other way around. What's going on?.
Do I have to change some settings in router?. Or is it firewall issue on those two machines?. Both of these boxes are connected by cable. Symbol of the router: TL-WR340G.
I just installed Fedora 13 on my desktop computer and ran into the same problems I did when I tried to install which was i could connect to a network but couldn't access the internet. I decided to install Fedora 14 since I already installed it on my laptop. I'm still running into the same issue, I can connect to my network but cannot connect to the internet using my PCI NIC or onboard NIC. Networking is enabled and I'm getting a IP address from my router. I ran "lspci" and it shows me both network cards which, please correct me if I'm wrong, makes me think that the drivers are installed.
I'm also curious if the VNC client/server could be used through a WAN. I would like to remote into my computer at home when I'm not there and see the gui. I had SSH installed at one point but it was just text. If there is better program please let me know. why I would have Services on my laptop but not on my desktop? Both computers are running the same version. Both cards are enabled and set to connect automatically. I can get a IP with both NICs. I only have one plugged in at a time.
Just installed FC13 on old laptop, (had FC11). Wifi card is recognized, but won't work. Instead of messing with ndiswrapper, etc., I am looking for a list of compatible cards or chipsets for cards that work with FC13. Anyone know where I can find such a thing? Or, can anyone recommend a specific card that works right out of the box with FC13? Need a cardbus card, PCI, not a USB.
I'm having problems getting two wlan cards to work under Networkmanager with F12. I have an old server that I wanted to move, so thought I'd get a USB wlan device for it. before setting up the server, I thought I'd try the USB (an Edimax EW-7711USn - Ralink 2870) on my laptop first. My laptop has an inbuilt ipw2200 card that works fine under NM.
So I've down loaded the DPO_RT3370_LinuxSTA_V2.4.0.1_20100831.tgz file from Ralink, and built the driver (after changing the os/linux/config.mk file for the WPA supplicant settings). I also install the rt2870 firmware (from Ralink) in the /lib/firmware directory. I also blacklisted the rt2800usb driver to ensure that that didn't get loaded.
The problem I have is that I can now get both the ipw2200 device and the rt2870 devices 'working', but they both try to assume the same IP (I want fixed IP's and not DHCP for them) - what is the way to configure the 'devices' so that the rt2870 device is always given IP x and the ipw2200 given IP y?
I think my problem is really my lack of understanding where/how NM handles the files under the GUI config. I used to semi understand how the old network config tool set up it's files and where they were etc. But with NM I'm a bit lost as to how it equates the device with the network settings. Once I have the device working with the correct driver on my laptop, I'll look to apply the same settings on the server (which is then FC13 - but should be simpler as it doesn't have an existing wlan interface).
Just installed squeeze and noticing slow responses to ping. Ping with -n is fine, and as expected. Ping without -n is very slow to appear on the screen.
ben@WOPR:~$ ping google.com PING google.com (74.125.230.114) 56(84) bytes of data. 64 bytes from 74.125.230.114: icmp_req=1 ttl=54 time=26.2 ms 64 bytes from 74.125.230.114: icmp_req=2 ttl=54 time=25.9 ms 64 bytes from 74.125.230.114: icmp_req=3 ttl=54 time=29.3 ms 64 bytes from 74.125.230.114: icmp_req=4 ttl=54 time=25.5 ms ^C64 bytes from 74.125.230.114: icmp_req=5 ttl=54 time=25.8 ms
--- google.com ping statistics --- 5 packets transmitted, 5 received, 0% packet loss, time 20199ms rtt min/avg/max/mdev = 25.514/26.569/29.308/1.399 ms ben@WOPR:~$ ping -n google.com PING google.com (74.125.230.115) 56(84) bytes of data. 64 bytes from 74.125.230.115: icmp_req=1 ttl=54 time=25.6 ms 64 bytes from 74.125.230.115: icmp_req=2 ttl=54 time=26.0 ms 64 bytes from 74.125.230.115: icmp_req=3 ttl=54 time=26.8 ms 64 bytes from 74.125.230.115: icmp_req=4 ttl=53 time=21.5 ms ^C --- google.com ping statistics --- 5 packets transmitted, 4 received, 20% packet loss, time 4006ms rtt min/avg/max/mdev = 21.540/25.042/26.859/2.064 ms
I've tried disabling ip6, disabling avahi and adding options single-request to my /etc/resolv.conf - problem remains. If it helps when installing Squeeze was prompted to install firmware-realtek, which I didn't have. So downloaded onto usb from another machine installed once setup was complete.
I have a fedora 10 box with two network card on eth0 I have a pppoe connection to the internet, on second card eth1 I share my internet connection end I set up a samba server but I don't know if the settings are good. How to do this settings right to work fine, the ip are assigned by dhcp I don't use any static ip .When I try to browse the internet from the other computers some site's like {.com ; .org ; .info} are block, other site from {.ro} are working. Someone tell me something about turn off all my filters, but I don't know where to find this filter to turn it off. And when I use samba I can't have and internet access or vice versa. My network look like that:
I'm running a Fedora 10 box behind a Comcast cable modem that provides squid and mail services to 15 XP and Vista workstations. I upgraded the ethernet cards on our Fedora box to support our new 1 gigabyte network. I kept the same device configuration eth0 and eth2 by updating the /etc/udev/net persistent file and changing the ethernet hardware address in the respective ifcfg-eht files in the /etc/sysconfig/network-scripts. The box booted to the new cards, the route and ifgonfig shows the new cards and their hardware addresses, the configuration looks as how the old cards looked (eth0 and eth2 respectfully). I was able to browse the local network and have access to the internet as before from inside the network . However I cannot get access to our web server that serves our web host and our VPN services from ouside our network. I tried stopping the firewall and still could nor connect from outside the network.Could my old ethernet hardware address be hard coded somewherel?
I've currently got the beta of fedora 12 installed, hope to upgrade that once the final release comes out. I'm having so many problems getting wireless to work. I've got a edimax ew-7711utn wireless adaptor. It doesn't work. Really what I want is to take it back and get a wireless card that will work.
For some reason some command line commands are unable to resolve urls, whereas other commands work as they should. I have checked most setting but am unable to find out what is wrong and am no closer to figuring out what and why.
[root@subzero ~]# yum update Loaded plugins: refresh-packagekit [URL]: [Errno 4] IOError: <urlopen error (-2, 'Name or service not known')> Trying other mirror. Error: Cannot retrieve repository metadata (repomd.xml) for repository: atrpms. Please verify its path and try again [root@subzero ~]# .....
My ISP (Insight if you know them) says I had open ports. OK I did! Shame on me! I'll blame my $15.00 router but I know it's my fault. OK took care of that.But when I run Shields Up from grc.com it keeps telling me it can ping (IMCP) me. I tried to get the firewall to stop, or drop the ping and it seems to on my local network, I can't ping my my boxes locally and I can't even ping my router. But Shields Up keeps telling me it can ping meAny one know how I can see what's sending the ping, or I guess they call it the pong, back to echo the ping?
I have been beating my brains out the last few days trying to get my linux box to ping my Pc's via the netbios name. (ping pc_name) I have read post after post with no luck at all. What i do know is that my pc's can ping the linux box via netbios name with no problem. Samba works from the pc's but not the other way around. I have added wins to my host in the nsswitch.conf fileMy smb.conf file:Quote:
global] workgroup = OFFICE server string = Samba Server Version %v
$ uname -rsmi Linux 2.6.33.8-149.fc13.i686.PAE i686 i386
I am using a dhcp network. Problem is I can SSH/ping to my machine but can't SSH/ping to my machine from the remote one(In internal network of my lab). What to do? I understand this is very little information....but I dont know what to provide.
Have installed fedora 14 on a HyperV virtual machine, have added a Legacy network adapter in the Hyper-V settings for this virtual machine that fedore pics up as eth0. I'm pretty sure this card is able to pick up an IP address from a DHCP server on our network but I'm unable to ping any boxes from this fedora virtual machine or ping the fedora machine from another box on the network. I have tried to disable the firewall and SELinux incase it was that stopping the pinging each way but that didn't help.
Not sure what iis going on, I can ping some hosts on the internet but not others see below (adobe is not the only example) Works OK from another host on the same network with same GW and DNS iptables is turned off
[root@havoc init.d]# ping www.arrl.org PING www.arrl.org (184.106.62.248) 56(84) bytes of data. 64 bytes from www.arrl.org (184.106.62.248): icmp_req=1 ttl=55 time=94.1 ms 64 bytes from www.arrl.org (184.106.62.248): icmp_req=2 ttl=55 time=93.0 ms 64 bytes from www.arrl.org (184.106.62.248): icmp_req=3 ttl=55 time=99.4 ms 64 bytes from www.arrl.org (184.106.62.248): icmp_req=4 ttl=55 time=96.8 ms
I have 4 installations of Fedora 14 running on a Win 2008 R2 server in Hyper-V.
When I try to ping my desktop or the host server via the hostname from within any of the Fedora installations, the ping fails. I can ping by IP without issue. Also if I try to ping the VMs from my desktop it fails. I have an XP VM setup that I can ping without issue via hostname and IP.
All of the VMs can access the Internet without issue. I have disabled all firewalls on all systems with no luck. My desktop can ping the Hyper-V server without issue so it would appear that the problem lies with the Fedora installations.
My resolv.conf
Code:
Does anyone have anything I can try to get the name resolution working?
